(19)

(11)

EP 3 990 403 A1

(12)

(43) Date of publication: 04.05.2022 Bulletin 2022/18 (21) Application number: 20732105.0 (22) Date of filing: 13.05.2020

(51) International Patent Classification (IPC):  C03B 5/04(2006.01) C03B 5/20(2006.01) C03B 5/185(2006.01) C03B 5/235(2006.01) (52) Cooperative Patent Classification (CPC): C03B 5/04; C03B 5/185; C03B 5/20; C03B 5/2353; Y02P 40/50 (86) International application number: PCT/EP2020/063376 (87) International publication number: WO 2020/229559 (19.11.2020 Gazette 2020/47)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 13.05.2019 GB 201906745 (71) Applicant: Fives Stein Limited Didcot, Oxfordshire OX11 7HB (GB)	(72) Inventors: REYNOLDS, Andrew Didcot Oxfordshire OX11 7HB (GB) KUHN, Wolf 94700 Maisons-Alfort (FR) MALPHETTES, Bruno 94700 Maisons-Alfort (FR) (74) Representative: Gallafent, Richard John  Gallafents Ltd 1 Sans Walk London EC1R 0LT London EC1R 0LT (GB)